| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutter knife prevented from damaging a backing without using an underlay such as a mat in using the cutter knife and being usable at any place and to provide its installation tool. SOLUTION: An arm 3 having the underlay 2 formed of a material prevented from being damaged by the knife cutting is attached to this cutter knife body 1. The attachment arms 4, 5 are movable, the cutting edge is movable, and the length is adjustable so that it is characterized by the smooth work.
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